#!/bin/bash

set -e

###############################################################################
# Script to create a podman container for testing NetworkManager.
#
# Commands:
#  - build: build a new image, named "$CONTAINER_NAME_REPOSITORY:$CONTAINER_NAME_TAG" ("nm:nm").
#  - run: start the container and tag it "$CONTAINER_NAME_NAME" ("nm").
#  - exec: run bash inside the container (this is the default).
#  - journal|j: print the journal from inside the container.
#  - stop: stop the container.
#  - reset: stop and delete the container.
#  - clean: stop and delete the container and the image.
#
# Options:
#  --no-cleanup: don't delete the CONTAINERFILE and other artifacts
#  --stop: only has effect with "run". It will stop the container afterwards.
#  -- [EXTRA_ARGS]:
#    - with command "exec", provide a command and arguments to run in the container.
#      Defaults to "bash".
#    - with command "journal", additional arguments that are passed to journalctl.
#
# It bind mounts the current working directory inside the container.
# You can run `make install` and run tests.
# There is a script nm-env-prepare.sh to generate a net1 interface for testing.
#
# This will bind-mount the NetworkManager working tree inside the container (and symlink
# from /NetworkManager). Create a file ".git/nm-in-container-host" to bind mount the host's
# "/" to "/Host".
#
# Create a symlink ./.git/NetworkManager-ci, to also bind-mount the CI directory.
# Create additional symlinks ./.git/nm-guest-link-*, to bind mount additional
# directories.
#
# Currently NM-ci requires a working eth1.
# Hence call `nm-env-prepare.sh --prefix eth -i 1 && sleep 1 && nmcli device connect eth1` before
# running a CI test.
###############################################################################

if [ -z "$BASE_IMAGE" ]; then
    if grep -q "^ID=fedora$" /etc/os-release 2>/dev/null ; then
        BASE_IMAGE="$(sed -n 's/^VERSION_ID=\([0-9]\+\)$/fedora:\1/p' /etc/os-release)"
    fi
fi
if [ -z "$BASE_IMAGE" ]; then
    BASE_IMAGE=fedora:latest
fi

BASEDIR_NM="$(readlink -f "$(dirname "$(readlink -f "$0")")/..")"
BASEDIR_DATA="$BASEDIR_NM/tools/nm-guest-data"

SYMLINK_NAME=()
SYMLINK_TARGET=()
for d in $(ls -1d "$BASEDIR_NM/.git/NetworkManager-ci" "$BASEDIR_NM/.git/nm-guest-link-"* 2>/dev/null) ; do
    NAME="${d##*/}"
    NAME="${NAME##nm-guest-link-}"
    TARGET="$(readlink -f "$d")"
    test -e "$TARGET"
    SYMLINK_NAME+=("$NAME")
    SYMLINK_TARGET+=("$TARGET")
done

CONTAINER_NAME_REPOSITORY=${CONTAINER_NAME_REPOSITORY:-nm}
CONTAINER_NAME_TAG=${CONTAINER_NAME_TAG:-nm}
CONTAINER_NAME_NAME=${CONTAINER_NAME_NAME:-nm}

EXEC_ENV=()

###############################################################################

usage() {
    cat <<EOF
$0: build|run|exec|stop|reset|reexec|clean|journal [--no-cleanup] [--stop] [-- EXTRA_ARGS]
EOF
    echo
    awk '/^####*$/{ if(on) exit; on=1} { if (on) { if (on==2) print(substr($0,3)); on=2; } }' "$BASH_SOURCE"
    echo
}

###############################################################################

die() {
    (
        echo -n -e "\033[31m"
        printf "%s" "$*"
        echo -e "\033[0m"
    ) >&2
    exit 1
}

###############################################################################

CLEANUP_FILES=()
DO_CLEANUP=1
cleanup() {
    test "$DO_CLEANUP" = 1 || return 0
    for f in "${CLEANUP_FILES[@]}" ; do
        rm -rf "$f"
    done
}

trap cleanup EXIT

###############################################################################

tmp_file() {
    cat > "$1"
    CLEANUP_FILES+=( "$1" )
    test -z "$2" || chmod "$2" "$1"
}

gen_file() {
    local PERMS
    [[ $1 =~ bin-* ]] && PERMS=755 || PERMS=644
    sed "s|{{BASEDIR_NM}}|$BASEDIR_NM|g" "$BASEDIR_DATA/$1.in" \
        | tmp_file "$BASEDIR_DATA/data-$1" $PERMS
}

bind_files() {
    VARIABLE_NAME="$1"

    ARR=()
    H=~

    ARR+=( -v "$BASEDIR_NM:$BASEDIR_NM" )

    if [ -e "$BASEDIR_NM/.git/nm-in-container-host" ] ; then
        ARR+=( -v /:/Host )
    fi

    for i in $(seq 1 ${#SYMLINK_TARGET[@]}) ; do
        j=$((i - 1))
        ARR+=( -v "${SYMLINK_TARGET[$j]}:${SYMLINK_TARGET[$j]}" )
    done

    for f in ~/.gitconfig* ~/.vim* ; do
        test -e "$f" || continue
        f2="${f#$H/}"
        [[ "$f2" = .viminf* ]] && continue
        [[ "$f2" = *.tmp ]] && continue
        [[ "$f2" = *~ ]] && continue
        f2="/root/$f2"
        ARR+=( -v "$f:$f2" )
    done

    eval "$VARIABLE_NAME=( \"\${ARR[@]}\" )"
}

create_dockerfile() {

    local CONTAINERFILE="$1"
    local BASE_IMAGE="$2"
    local GEN_FILES="bin-nm-env-prepare.sh bin-nm-deploy.sh bin-_nm-in-container-setup.sh
        etc-rc.local etc-motd-container etc-bashrc.my etc-bashrc-motd.my nm-90-my.conf
        nm-95-user.conf home-bash_history home-gdbinit home-gdb_history home-behaverc
        systemd-20-nm.override"

    cp "$BASEDIR_NM/contrib/scripts/NM-log" "$BASEDIR_DATA/data-bin-NM-log"
    CLEANUP_FILES+=( "$BASEDIR_DATA/data-NM-log" )

    for f in $GEN_FILES; do
        gen_file "$f"
    done
    chmod 755 "$BASEDIR_DATA/data-etc-rc.local"

    RUN_LN_BASEDIR_NM=
    if [ -n "$BASEDIR_NM" -a "$BASEDIR_NM" != "/NetworkManager" ] ; then
        RUN_LN_BASEDIR_NM="RUN ln -snf \"$BASEDIR_NM\" /NetworkManager"
    fi

    RUN_LN_SYMLINK_CMDS=""
    for i in $(seq 1 ${#SYMLINK_NAME[@]}) ; do
        j=$((i - 1))
        if [ -d "${SYMLINK_TARGET[$j]}" ] ; then
            RUN_LN_SYMLINK_CMDS="$RUN_LN_SYMLINK_CMDS"$'\n'"RUN ln -snf \"${SYMLINK_TARGET[$j]}\" \"/${SYMLINK_NAME[$j]}\""
        fi
    done

    cat <<EOF | tmp_file "$CONTAINERFILE"
FROM $BASE_IMAGE

ENTRYPOINT ["/sbin/init"]

RUN sed -i 's/^tsflags=.*/tsflags=/' /etc/dnf/dnf.conf

RUN dnf install -y \\
    --skip-broken \\
    \\
    /usr/bin/python \\
    /usr/sbin/ausearch \\
    ModemManager-devel \\
    ModemManager-glib-devel \\
    NetworkManager \\
    audit-libs-devel \\
    bash-completion \\
    bind-utils \\
    black \\
    bluez-libs-devel \\
    ccache \\
    clang \\
    clang-tools-extra \\
    cscope \\
    dbus-devel \\
    dbus-x11 \\
    dhclient \\
    dnsmasq \\
    firewalld-filesystem \\
    gcc-c++ \\
    gdb \\
    gettext-devel \\
    git \\
    glib2-doc \\
    glibc-langpack-pl \\
    gnutls-devel \\
    gobject-introspection-devel \\
    gtk-doc \\
    intltool \\
    iproute \\
    iproute-tc \\
    iptables \\
    jansson-devel \\
    libasan \\
    libcurl-devel \\
    libndp-devel \\
    libpsl-devel \\
    libselinux-devel \\
    libtool \\
    libubsan \\
    libuuid-devel \\
    make \\
    meson \\
    mlocate \\
    mobile-broadband-provider-info-devel \\
    newt-devel \\
    nispor \\
    nmstate \\
    nss-devel \\
    polkit-devel \\
    ppp \\
    ppp-devel \\
    procps \\
    python3-behave \\
    python3-black \\
    python3-dbus \\
    python3-devel \\
    python3-gobject \\
    python3-pexpect \\
    python3-pip \\
    python3-pyte \\
    python3-pyyaml \\
    qt-devel \\
    radvd \\
    readline-devel \\
    rp-pppoe \\
    rpm-build \\
    strace \\
    systemd \\
    systemd-devel \\
    tcpdump \\
    teamd-devel \\
    vala \\
    vala-devel \\
    valgrind \\
    vim \\
    which \\
    \\
    'dbus*' \\
    'openvswitch2*' \\
    /usr/bin/pytest \\
    /usr/bin/debuginfo-install \\
    NetworkManager-openvpn \\
    NetworkManager-pptp \\
    NetworkManager-strongswan \\
    NetworkManager-vpnc \\
    NetworkManager-ovs \\
    NetworkManager-wifi \\
    NetworkManager-team \\
    NetworkManager-ppp \\
    cryptsetup \\
    dhcp-client \\
    dhcp-relay \\
    dhcp-server \\
    dnsmasq \\
    dracut-network \\
    ethtool \\
    firewalld \\
    gcc \\
    git \\
    hostapd \\
    iproute-tc \\
    ipsec-tools \\
    iputils \\
    iscsi-initiator-utils \\
    iw \\
    ldns \\
    libreswan \\
    libselinux-utils \\
    libyaml-devel \\
    logrotate \\
    lvm2 \\
    mdadm \\
    net-tools \\
    nfs-utils \\
    nmap-ncat \\
    nss-tools \\
    openvpn \\
    perl-IO-Pty-Easy \\
    perl-IO-Tty \\
    psmisc \\
    python3-dbus \\
    python3-gobject \\
    python3-netaddr \\
    qemu-kvm \\
    radvd \\
    rp-pppoe \\
    scsi-target-utils \\
    tcpdump \\
    tcpreplay \\
    tuned \\
    wireguard-tools \\
    wireshark-cli

RUN dnf debuginfo-install --skip-broken NetworkManager \$(ldd /usr/sbin/NetworkManager | sed -n 's/.* => \\(.*\\) (0x[0-9A-Fa-f]*)$/\1/p' | xargs -n1 readlink -f) -y

RUN dnf clean all

RUN pip3 install --user behave_html_formatter || true

RUN mkdir -p /etc/systemd/system/NetworkManager.service.d

COPY data-bin-NM-log "/usr/bin/NM-log"
COPY data-bin-nm-env-prepare.sh "/usr/bin/nm-env-prepare.sh"
COPY data-bin-nm-deploy.sh "/usr/bin/nm-deploy.sh"
COPY data-bin-_nm-in-container-setup.sh "/usr/bin/_nm-in-container-setup.sh"
COPY data-etc-rc.local "/etc/rc.d/rc.local"
COPY data-etc-motd-container /etc/motd
COPY data-etc-bashrc.my /etc/bashrc.my
COPY data-etc-bashrc-motd.my /etc/bashrc-motd.my
COPY data-nm-90-my.conf /etc/NetworkManager/conf.d/90-my.conf
COPY data-nm-95-user.conf /etc/NetworkManager/conf.d/95-user.conf
COPY data-home-bash_history /root/.bash_history
COPY data-home-gdbinit /root/.gdbinit
COPY data-home-gdb_history /root/.gdb_history
COPY data-home-behaverc /root/.behaverc
COPY data-systemd-20-nm.override /etc/systemd/system/NetworkManager.service.d/20-nm.override

RUN systemctl enable NetworkManager

# Generate a stable machine id.
RUN echo "10001000100010001000100010001000" > /etc/machine-id

RUN echo -e "# Default from the container image\nnameserver 8.8.8.8" > /etc/resolv.conf

# Generate a fixed (version 1) secret key.
RUN mkdir -p /var/lib/NetworkManager
RUN chmod 700 /var/lib/NetworkManager
RUN echo -n "nm-in-container-secret-key" > /var/lib/NetworkManager/secret_key
RUN chmod 600 /var/lib/NetworkManager/secret_key

RUN sed 's/.*RateLimitBurst=.*/RateLimitBurst=0/' /etc/systemd/journald.conf -i

$RUN_LN_BASEDIR_NM
$RUN_LN_SYMLINK_CMDS

RUN rm -rf /etc/NetworkManager/system-connections/*

RUN echo -e '\n. /etc/bashrc.my\n' >> /etc/bashrc
RUN echo -e '\n. /etc/bashrc-motd.my\n' >> /etc/bashrc

RUN updatedb
EOF
}

###############################################################################

container_image_exists() {
    podman image exists "$1" || return 1
}

container_exists() {
    podman container exists "$1" || return 1
}

container_is_running() {
    test "$(podman ps --format "{{.ID}} {{.Names}}" | sed -n "s/ $1\$/\0/p")" != "" || return 1
}

###############################################################################

do_reset() {
    podman stop "$CONTAINER_NAME_NAME" || :
    podman rm "$CONTAINER_NAME_NAME" || :
}

do_clean() {
    do_reset
    podman rmi "$CONTAINER_NAME_REPOSITORY:$CONTAINER_NAME_TAG" || :
}

do_build() {
    container_image_exists "$CONTAINER_NAME_REPOSITORY:$CONTAINER_NAME_TAG" && return 0

    CONTAINERFILE="$BASEDIR_DATA/containerfile"
    create_dockerfile "$CONTAINERFILE" "$BASE_IMAGE"
    podman build --squash-all --tag "$CONTAINER_NAME_REPOSITORY:$CONTAINER_NAME_TAG" -f "$CONTAINERFILE"
}

do_run() {
    do_build

    if container_is_running "$CONTAINER_NAME_NAME" ; then
        return 0
    fi

    if container_exists "$CONTAINER_NAME_NAME" ; then
        podman start "$CONTAINER_NAME_NAME"
        return 0
    fi

    bind_files BIND_FILES

    podman run --privileged \
        --name "$CONTAINER_NAME_NAME" \
        --dns=none \
        --no-hosts \
        -d \
        "${BIND_FILES[@]}" \
        "$CONTAINER_NAME_REPOSITORY:$CONTAINER_NAME_TAG"
}

do_exec() {
    do_run

    local e
    local EXTRA_ARGS=("$@")
    if [ "${#EXTRA_ARGS[@]}" = 0 ]; then
        EXTRA_ARGS=('bash')
    fi

    local ENV=()
    for e in "${EXEC_ENV[@]}" ; do
        ENV+=(-e "$e")
    done

    podman exec "${ENV[@]}" --workdir "$BASEDIR_NM" -it "$CONTAINER_NAME_NAME" "${EXTRA_ARGS[@]}"

    if [ "$DO_STOP" = 1 ]; then
        do_stop
    fi
}

do_reexec() {
    do_reset
    do_exec "$@"
}

do_journal() {
    EXEC_ENV+=( "SYSTEMD_COLORS=0" )
    do_exec "journalctl" --no-pager "$@"
}

do_stop() {
    container_is_running "$CONTAINER_NAME_NAME" || return 0
    podman stop "$CONTAINER_NAME_NAME"
}

###############################################################################

DO_STOP=0
CMD=exec
EXTRA_ARGS=()
for (( i=1 ; i<="$#" ; )) ; do
    c="${@:$i:1}"
    i=$((i+1))
    case "$c" in
        --no-cleanup)
            DO_CLEANUP=0
            ;;
        --stop)
            DO_STOP=1
            ;;
        j)
            CMD=journal
            ;;
        build|run|exec|stop|reset|reexec|clean|journal)
            CMD=$c
            ;;
        --)
            EXTRA_ARGS=( "${@:$i}" )
            break
            ;;
        -h|--help)
            usage
            exit 0
            ;;
        *)
            if [ "$CMD" = "journal" ]; then
                EXTRA_ARGS=( "${@:$((i-1))}" )
                break;
            else
                usage
                die "invalid argument: $c"
            fi
            ;;
    esac
done

###############################################################################

test "$UID" != 0 || die "cannot run as root"

if test "$CMD" != exec -a "$CMD" != journal -a "$CMD" != reexec -a "${#EXTRA_ARGS[@]}" != 0 ; then
    die "Extra arguments are only allowed with exec|journal|reexec command"
fi

###############################################################################

do_$CMD "${EXTRA_ARGS[@]}"
